Light source for a lighting unit



FIG. 1 is a front view of a light source for a lighting unit showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof, the left side view being a mirror image of the right side view;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a light source for a lighting unit, as shown. 